The roads and railroads, vehicles, and modes of travelling, of ancient and modern countries; with accounts of bridges, tunnels, and canals, in various parts of the world .. (1839)
London : J.W. Parker · leaf 297
ng-valve; so as to make the bottom ofthe cylinder communicate with the external air, and to al-low the steam from the boiler to be admitted at the top ofthe cylinder, whereby the piston is pushed down ready foranother up-stroke. There are many modes used for pro-ducing this alternate passage of the…
Roads · Railroads · Bridges · Vehicles
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